HLT ***HLT crashes the microprocessor. When this opcode is executed, program execution ceases. No hardware interrupts will execute either. The author has characterized this instruction as a halt instruction since this is the most straightforward explanation for this opcode's behaviour. Only a reset will restart execution. This opcode leaves no trace of any operation performed! No registers affected.

Opcodes: 02, 12, 22, 32, 42, 52, 62, 72, 92, B2, D2, F2.

TAS ***This opcode ANDs the contents of the A and X registers (without changing the contents of either register) and transfers the result to the stack pointer. It then ANDs that result with the contents of the high byte of the target address of the operand +1 and stores that final result in memory.